Unassisted solar-driven photoelectrosynthetic HI splitting using membrane-embedded Si microwire arrays

Shane Ardo, Sang Hee Park, Emily L. Warren, Nathan S Lewis

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Free-standing, membrane-embedded, Si microwire arrays have been used to affect the solar-driven, unassisted splitting of HI into H2 and I3-. The Si microwire arrays were grown by a chemical-vapor-deposition vapor-liquid-solid growth process using Cu growth catalysts, with a radial n+p junction then formed on each microwire. A Nafion proton-exchange membrane was introduced between the microwires and Pt electrocatalysts were then photoelectrochemically deposited on the microwires. The composite Si/Pt-Nafion membrane was mechanically removed from the growth substrate, and Pt electrocatalysts were then also deposited on the back side of the structure. The resulting membrane-bound Si microwire arrays spontaneously split concentrated HI into H2(g) and I3- under 1 Sun of simulated solar illumination. The reaction products (i.e. H2 and I3-) were confirmed by mass spectrometry and ultraviolet-visible electronic absorption spectroscopy.

Original languageEnglish
Pages (from-to)1484-1492
Number of pages9
JournalEnergy and Environmental Science
Volume8
Issue number5
DOIs
Publication statusPublished - May 1 2015

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membrane
Membranes
Electrocatalysts
atomic absorption spectroscopy
Absorption spectroscopy
Reaction products
Sun
Mass spectrometry
Protons
Chemical vapor deposition
Ion exchange
mass spectrometry
Lighting
catalyst
Vapors
substrate
Catalysts
liquid
Composite materials
Liquids

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Environmental Chemistry
  • Pollution
  • Nuclear Energy and Engineering

Cite this

Unassisted solar-driven photoelectrosynthetic HI splitting using membrane-embedded Si microwire arrays. / Ardo, Shane; Park, Sang Hee; Warren, Emily L.; Lewis, Nathan S.

In: Energy and Environmental Science, Vol. 8, No. 5, 01.05.2015, p. 1484-1492.

Research output: Contribution to journalArticle

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